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Proj4 extension for rgeo.
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Gem Version Build Status

This project contains proj.4 extensions to the rgeo gem.

Documentation about proj.4 is available at


Add this line to your Gemfile:

gem "rgeo-proj4"

And then execute:

$ bundle

Or install it yourself as:

$ gem install rgeo-proj4


Install proj.4 using your package manager:


brew install proj


apt-get install libproj-dev

Or download binaries at

By default, the gem looks for the Proj4 library in the following paths:


If Proj4 is installed in a different location, you must provide its installation prefix directory using the --with-proj-dir option.


After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to


Bug reports and pull requests are welcome on GitHub at This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.


The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the rgeo-proj4 project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.

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